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Thu, 1 Oct 2026 10:32:48 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 1 Oct 2026 10:32:48 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Niklas Schnelle , Matthew Rosato , Gerald Schaefer , Vineeth Vijayan , Peter Oberparleiter , Harald Freudenberger , Holger Dengler , Stefan Haberland , Jan Hoeppner , Ilya Leoshkevich , Janosch Frank , Claudio Imbrenda Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH 03/32] s390: Clear pt_regs flags field Date: Thu, 1 Oct 2026 12:32:18 +0200 Message-ID: <20261001103247.1989111-4-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261001103247.1989111-1-hca@linux.ibm.com> References: <20261001103247.1989111-1-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=FYWiV5+6 c=1 sm=1 tr=0 ts=6abe36d6 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=vG85Bs01LOTUVlHRul4A:9 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDAxMDA0MCBTYWx0ZWRfX4zPqPjq/RYV0 5xOHCnvr7Rjy3Vufe4AMlb6YmC2MFHinMB0JpBZHhvYFz+AKOB67FIZBXlVynleQikTTjwI4nFm KD5B5EH+ETDcL1EDcioSm+PuUvNyDfA= X-Proofpoint-ORIG-GUID: uv-ix80b-h3VBfViWJOsGcIyYlP6guJC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDAxMDA0MCBTYWx0ZWRfXxm6VbNIkMjAp jR5nQSm20KTN9cCx4tzJCiiOqrGKGqZvkz76qLY3OO3eKTZkkD7y80iItlhRi4HLSAsmZiqj48u mR4tNbDlHbNcI9cN9jyDb6rDVgeppNsn8MIOf4/gjxBVgD9Ug7F029tze9qZALMbzsuNJZUEWao k1WTP1y/bv14BN8kEiyTUeT766xRL4OCyBmyPTVucMkE0bC9w8jySwQ2Z9Hle18BN6bVf7whB+5 gCV+VL4nvHlHEF+zz0y9OVNm36lekeWBVJvIGdWGf8qiyEbx11fyAg5lK+9BxD/6l4pR2m4C+0T vr9jz72FuZQEEyX0ovq2ijdLr/rRcDXrS/E9SaatF8GXN08jiKaLIaVvhF3mgyyY8D9UkbRTqNf MZ5oMHPn5GV6+r6eiEEStIDtR7N8Ryl31MChCzOg1KeClx5VrN5YDMOwSoEZTyxLpUK335kBooQ jUnOq7P2fslOHJjAsDw== X-Proofpoint-GUID: uv-ix80b-h3VBfViWJOsGcIyYlP6guJC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-01_03,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 impostorscore=0 spamscore=0 phishscore=0 priorityscore=1501 malwarescore=0 bulkscore=0 lowpriorityscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610010040 Clear the pt_regs flags field in the early program check handler as well as in the stack_invalid handler. Without this the pt_regs flags field will have random values, depending on previous stack contents. This matters currently for bug reporting and disassembly, where flags like PIF_PSW_ADDR_ADJUSTED may then be incorrectly set, which could lead to a partially incorrect disassembly or wrong code markers. Signed-off-by: Heiko Carstens --- arch/s390/kernel/early.c | 1 + arch/s390/kernel/entry.S | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 1fc153d8385b..b8e3c065fbec 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -154,6 +154,7 @@ void __init __do_early_pgm_check(struct pt_regs *regs) { struct lowcore *lc = get_lowcore(); + regs->flags = 0; regs->int_code = lc->pgm_int_code; regs->int_parm_long = lc->trans_exc_code; regs->last_break = lc->pgm_last_break; diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 10dd9bbdf985..f51ecd8e7d21 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -621,6 +621,7 @@ SYM_CODE_START(stack_invalid) stmg %r0,%r7,__PT_R0(%r11) stmg %r8,%r9,__PT_PSW(%r11) mvc __PT_R8(64,%r11),0(%r14) + xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) GET_LC %r2 mvc __PT_ORIG_GPR2(8,%r11),__LC_PGM_LAST_BREAK(%r2) xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) -- 2.53.0